Viddler

Enhanced reductive dechlorination (ERD) is an effective approach for bioremediation of chlorinated solvents and other groundwater contaminants. However, many dechlorinators are pH sensitive and dechlorination rates can decline below a pH of 6. The...

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Enhanced reductive dechlorination (ERD) is an effective approach for bioremediation of chlorinated solvents and other groundwater contaminants. However, many dechlorinators are pH sensitive and dechlorination rates can decline below a pH of 6. The reductive dechlorination process can reduce the pH in poorly buffered aquifers where a neutral pH is required for biodegradation to proceed. A neutral pH can be maintained using aqueous buffers, commonly sodium bicarbonate or calcium carbonate. However, this procedure is maintenance intensive. In addition, sodium bicarbonate can significantly increase the salt concentration of the aquifer.
This Webinar will present a general overview of processes controlling pH and their influence on reductive dechlorination including: (1) hydrochloric and carbonic acid release during ERD; (2) effect of pH on dehalogenation rates; (3) natural pH buffering by carbonate and clay minerals; and (4) alkalinity produced during denitrification, iron and sulfate reduction.

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